WIEGAND, J.; FEIGE, S. Thoron: Ignored and underestimated in the big shadow of radon - an example from China. Geofísica Internacional, [S. l.], v. 41, n. 3, p. 261–264, 2002. DOI: 10.22201/igeof.00167169p.2002.41.3.340. Disponível em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/782. Acesso em: 6 may. 2024.